From the Atlantic:

The USDA's recent decision to (re)deregulate genetically modified (GM) alfalfa has sent a shock wave of panic through the organic foods industry. Samuel Fromartz explained to Food Channel readers how "the move has been opposed by organic farmers and consumers because of the strong possibility that genetically modified alfalfa will cross-pollinate non-GM alfalfa." In essence, organic growers (who produce between .5 and 1 percent of the nation's alfalfa) could have their product contaminated by gene flow from genetically modified seed and, as a result, have their hard-earned organic designation undermined. Of course, this seems terribly unfair.

 … as I encountered one condemnatory article after another regarding Tom Vilsack's choice to deregulate GM alfalfa, I kept wondering what I often wonder when grappling with an agricultural controversy: where's the data? Fromartz (echoing the standard line) refers to the "strong possibility" of contamination. Okay. How strong?

For the complete article, please see: The Genetically Modified Alfalfa Scare: Don't Panic